The eyepiece of a refracting telescope (see Fig. 34.53 ) has...

The eyepiece of a refracting telescope (see Fig. 34.53 ) has a focal length of 9.00 $\mathrm{cm}$ . The distance between objective and eye-piece is 1.80 $\mathrm{m}$ and the final image is at infinity. What is the angular magnification of the telescope?

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Key Concepts

Refracting Telescope

A refracting telescope is an optical instrument that uses lenses to gather and focus light from distant objects to form an image. It typically consists of two main parts: the objective lens, which collects light and forms an initial image, and the eyepiece, which magnifies that image for the observer.

Focal Length

Focal length is a fundamental optical parameter that represents the distance over which parallel rays of light converge to a point or appear to diverge from a point. In telescopes, both the objective and the eyepiece have focal lengths that determine the overall imaging characteristics and magnification.

Angular Magnification

Angular magnification is a measure of how much the angular size of an object is increased by an optical instrument, such as a telescope. It is generally calculated by taking the ratio of the focal lengths of the objective lens to the eyepiece, thereby indicating how much larger an object appears when viewed through the instrument.

Final Image at Infinity

When a telescope is configured so that the final image is at infinity, it means that the light rays emerging from the eyepiece are parallel. This setup allows the observer's eye to remain relaxed as it does not need to accommodate for a near image, which is ideal for prolonged astronomical observations.

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